<?php
namespace app\backend\org;

class upload
{

}
$uploaddir = "./files/";//设置文件保存目录 注意包含/
$type=array("jpg","gif","bmp","jpeg","png");//设置允许上传文件的类型
$patch="http://127.0.0.1/cr_downloadphp/upload/files/";//程序所在路径

//获取文件后缀名函数
function fileext($filename)
{
    return substr(strrchr($filename, '.'), 1);
}
//生成随机文件名函数
function random($length)
{
    $hash = 'CR-';
    $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
    $max = strlen($chars) - 1;
    mt_srand((double)microtime() * 1000000);
    for($i = 0; $i < $length; $i++)
    {
        $hash .= $chars[mt_rand(0, $max)];
    }
    return $hash;
}
$a=strtolower(fileext($_FILES['file']['name']));
//判断文件类型
if(!in_array(strtolower(fileext($_FILES['file']['name'])),$type))
{
    $text=implode(",",$type);
    echo "您只能上传以下类型文件: ",$text,"<br>";
}
//生成目标文件的文件名
else{
    $filename=explode(".",$_FILES['file']['name']);
    do
    {
        $filename[0]=random(10); //设置随机数长度
        $name=implode(".",$filename);
        //$name1=$name.".Mcncc";
        $uploadfile=$uploaddir.$name;
    }
    while(file_exists($uploadfile));
    if (move_uploaded_file($_FILES['file']['tmp_name'],$uploadfile)){

        if(is_uploaded_file($_FILES['file']['tmp_name'])){
            //输出图片预览
            echo "<center>您的文件已经上传完毕 上传图片预览: </center><br><center><img src='$uploadfile'></center>";
            echo"<br><center><a href='javascript:history.go(-1)'>继续上传</a></center>";
        }
        else{
            echo "上传失败！";
        }
    }
}

